Military.com reports that “the chairman of the Joint Chiefs of Staff estimates the U.S.-led fight against Islamic militants in Iraq and Syria will last up to four years.”  

“Army Gen. Martin Dempsey made the estimate on Wednesday during an interview at Atlantic Media’s Defense One conference in Washington, D.C. about the fight against the Islamic State in Iraq and Syria, or ISIS.”  

“The U.S. started launching airstrikes against ISIS in Iraq and Syria to thwart the organization’s advances in some areas, though the militants still control vast parts of northern and western Iraq and eastern Syria.”